222444121 has 4 divisors (see below), whose sum is σ = 222546852. Its totient is φ = 222341392.

The previous prime is 222444107. The next prime is 222444137. The reversal of 222444121 is 121444222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119137225 + 103306896 = 10915^2 + 10164^2 .

It is a cyclic number.

It is not a de Polignac number, because 222444121 - 2⁷ = 222443993 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222444092 and 222444101.

It is not an unprimeable number, because it can be changed into a prime (222444151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48046 + ... + 52471.

It is an arithmetic number, because the mean of its divisors is an integer number (55636713).

Almost surely, 2^222444121 is an apocalyptic number.

It is an amenable number.

222444121 is a deficient number, since it is larger than the sum of its proper divisors (102731).

222444121 is a wasteful number, since it uses less digits than its factorization.

222444121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102730.

The product of its digits is 1024, while the sum is 22.

The square root of 222444121 is about 14914.5607042246. The cubic root of 222444121 is about 605.9084056289.

Adding to 222444121 its reverse (121444222), we get a palindrome (343888343).

The spelling of 222444121 in words is "two hundred twenty-two million, four hundred forty-four thousand, one hundred twenty-one".